(19)

(11)

EP 3 818 242 A1

(12)

(43) Date of publication: 12.05.2021 Bulletin 2021/19 (21) Application number: 19833515.0 (22) Date of filing: 05.07.2019

(51) International Patent Classification (IPC):  E21B 10/38(2006.01) E21B 10/00(2006.01) E21B 10/40(2006.01) (86) International application number: PCT/US2019/040674 (87) International publication number: WO 2020/014082 (16.01.2020 Gazette 2020/03)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 07.07.2018 US 201862694972 P (71) Applicant: Smith International, Inc. Houston, TX 77073 (US)	(72) Inventors: PORTWOOD, Gary R. 56048 Saline di Volterra (IT) PALLESI, Simone 56048 Saline di Volterra (IT) CECHI, Alessio 56048 Saline di Volterra (IT) BERTINI, Alessandro 56048 Saline di Volterra (IT) (74) Representative: Schlumberger Intellectual Property Department  Parkstraat 83 2514 JG Den Haag 2514 JG Den Haag (NL)